Mosquitoes captured in a horse-baited stable trap in southeast Louisiana.

This research aimed to identify the main mosquito species that feed on horses and could potentially transmit the Eastern Equine Encephalomyelitis virus, within distinct areas of St. Tammany Parish in Louisiana.

Research Objectives and Methodology

• The primary goal of this study was to determine the main horse-feeding mosquito species in St. Tammany Parish, southeastern Louisiana. These species could potentially function as probable bridging and epidemic vectors of Eastern equine encephalomyelitis virus, a serious disease that affects both humans and horses.
• This investigation was conducted over two years, 1993 and 1994, in three ecologically distinct sites within the parish. In order to collect the mosquitoes, horse-baited stable traps were used.

Findings

• A total of 4,535 mosquitoes of 26 different species were collected in 1993, and 23,906 mosquitoes in 1994.
• Several species were found in relatively large numbers and with high engorgement rates, making them significant horse-feeding mosquitoes in the area. These include Culex salinarius, Cx. (Melanoconion) spp., Aedes vexans, Psophora ferox, Coquillettidia perturbans, Anopheles quadrimaculatus, An. crucians, Ps. columbiae. Ae. albopictus, and Ochlerotatus atlanticus.

Implications

• The findings of this study contribute to a better understanding of mosquito species that feed on horses and potentially carry Eastern Equine Encephalomyelitis virus, enhancing our comprehension of the transmission dynamics of this disease.
• Understanding the species that act as potential carriers helps in developing targeted pest control strategies and preventative measures to combat the spread of the disease.
• Further research can be conducted into specific strategies to manage or reduce the population of these identified species, in order to minimize the risk of virus transmission.